We are new to fNIRS data pre-processing of the oxy-graphs and are wondering if the "median filter" process is commonly used. We've looked in some recent articles (e.g. Pinti et al, 2020, Hocke et al, 2018) and don't see the median filter used, although it is an option in our fNIRS manual (using the Biopac system). Can anyone provide any guidance or advice? thanks.